If you're selling Johnson or just need cover in rwb, retrain Henderson. He plays really well there, especially when on the attack.
My first transfer window, I usually invest heavily in youth, or save my money for Jan. By Jan, im almost always able to offload deadwood like Assaidi and Borini, and bring in a big name player (usually I go for Isco or Lamela for 25m +).
If you need stop-gaps to get you to Jan, Sterling and Suso usually play well above expectations. Or, depending on your formation you can play Suarez on the wing opposite Coutinho with Sturridge as your ST.